Before I wised up and bought a tumbler, my method was to fill a bucket 1/4 full of hot water, vinegar and salt then dump unprimed dirty brass and agitate for a couple minutes. Rinse in water, dry with a towel then set them in an oven at 250f for an hour to dry.
They weren't shiny or really that clean, but it got the dirt off for the most part.
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